Spring Boot Actuator：如何在自定义 HealthIndicator 中获取指标正常运行时间？

Question

我想做一个取决于应用程序正常运行时间的自定义 HealthIndicator。

@Component
public class HealthActuator implements HealthIndicator {

    private final MetricsEndpoint metricsEndpoint;

    @Autowired
    public HealthActuator(MetricsEndpoint metricsEndpoint) {
        this.metricsEndpoint = metricsEndpoint;
    }

    @Override
    public Health health() {
        long uptime = (Long) metricsEndpoint.invoke().get("uptime");
        // logic with uptime
        return Health.up().build();
    }

}

但是出现错误：a circular dependency between 2 beans in the application context.

我可以通过对端点进行休息调用来获取正常运行时间指标 /actuator/health。

但也许可以通过编程来实现？

P.S。日志堆栈跟踪：

11-01 14:34:09 WARN org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext - Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'healthActuator' defined in file [/Users/serge/projects/bb/bb-imapl/target/classes/bb/imapl/config/HealthActuator.class]: Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.boot.actuate.autoconfigure.EndpointAutoConfiguration': Bean instantiation via constructor failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.boot.actuate.autoconfigure.EndpointAutoConfiguration$$EnhancerBySpringCGLIB$bb06d4a]: Constructor threw exception; nested exception is org.springframework.beans.factory.BeanCurrentlyInCreationException: Error creating bean with name 'healthActuator': Requested bean is currently in creation: Is there an unresolvable circular reference?
11-01 14:34:09 WARN org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext - Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'healthActuator' defined in file [/Users/serge/projects/bb/bb-imapl/target/classes/bb/imapl/config/HealthActuator.class]: Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'org.springframework.boot.actuate.autoconfigure.EndpointAutoConfiguration': Bean instantiation via constructor failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.boot.actuate.autoconfigure.EndpointAutoConfiguration$$EnhancerBySpringCGLIB$bb06d4a]: Constructor threw exception; nested exception is org.springframework.beans.factory.BeanCurrentlyInCreationException: Error creating bean with name 'healthActuator': Requested bean is currently in creation: Is there an unresolvable circular reference?
11-01 14:34:09 ERROR org.springframework.boot.diagnostics.LoggingFailureAnalysisReporter - 

***************************
APPLICATION FAILED TO START
***************************

Description:

There is a circular dependency between 2 beans in the application context:
    - healthActuator defined in file [/Users/serge/projects/bb/bb-imapl/target/classes/bb/imapl/config/HealthActuator.class]
    - org.springframework.boot.actuate.autoconfigure.EndpointAutoConfiguration
    - healthActuator


11-01 14:34:09 ERROR org.springframework.boot.diagnostics.LoggingFailureAnalysisReporter -

Answer 1

EndpointAutoConfiguration 依赖于 HealthIndicator（您使用 HealthActuator 实现）。

所以你最终得到了循环依赖。当 2 个 bean 需要彼此实例化自己（通过构造函数注入）时，就会发生这种情况。您可以使用 setter 注入来打破循环：

@Component
public class HealthActuator implements HealthIndicator {
    private MetricsEndpoint metricsEndpoint;

    @Autowired
    private void setMetricsEndpoint(MetricsEndpoint metricsEndpoint) {
        this.metricsEndpoint = metricsEndpoint;
    }

    public HealthActuator() {
    }

    @Override
    public Health health() {
        long uptime = (Long) metricsEndpoint.invoke().get("uptime");
        // logic with uptime
        return Health.up().build();
    }
}

Answer 2

如果您不喜欢 setter 注入，也可以使用 @Lazy...

来解决这个问题

@Autowired
public HealthActuator(@Lazy MetricsEndpoint metricsEndpoint) {
    this.metricsEndpoint = metricsEndpoint;
}

Spring Boot Actuator：如何在自定义 HealthIndicator 中获取指标正常运行时间？

Spring Boot Actuator: How to get metrics uptime inside a custom HealthIndicator?

java

spring

spring-boot

spring-boot-actuator